In a studio, each separate element of a recording (e.g., vocals, guitar, bass, drums) is recorded separately and then combined together to create the final recording.
Remastering is the practice of going back to those recording elements and changing them before mixing them together again, and/or mixing them together differently.
This can be done just to clean things up if they originally sounded muddy or noisy, or things may be changed in more subjective ways owing to people’s preferences changing.
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